www.maseslighting.com.au / The order was broken and seller didn't change it

I searched for the cheap LED lights and found the website www.maseslighting.com.au. I was upset, because they delivered order on time, but the condition was very bad. None of these lights worked at all. I returned the whole order back, but the seller hasn’t provided new order or even replied to my emails.
I want to get my money back and have no idea how to do it. If there are people, who can help me, please help me.